Sand-drum for sandpapering-mach ines



(No Model.)

J. R. THOMAS.

SAND DRUM FOR SAND PAPERING MACHINES. Ne. 275,733.

Patented Apr. 10,1883.

u. PEYERS, Phm-umn n h-r, Waihinglun. 0,0.

I UNITED STATES PATENT OFFICE.

JOHN R. THOMAS, OF CINCINNATI, OHIO.

SAND-DRUM FOR SANDPAPERING-M-ACHINE'S.

SPECIFICATION forming part of Letters Patent No. 275,733, dated April I0, 1883.

Application tiled January 27, 1883. (No model.)

To all whom it may concern:

Be it known that I, JoHN R. THOMAS, a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Sand-Drums for Sandpapering-Machines, of which the following is a specification.

My invention relates to improvements in sand or polishing drums, particularly that class used in sandpapering-machines.

The principal object of my invention is to provide the peripheral face of a sand-drum with one or more polishing-brushes.

Another object of my invention is to provide in the face of the drum or roller grooves or depressions, in which the sand-paper, its backing, and the frames of the brush or brushes set and are properly secured in place by bolts or otherwis In the acco nyanying drawings, Figure 1 is an end view of a sand-drum embodying my invention, showing three brushes on its peripheral face; and Fig. 2 is a longitudinal elevation of the same, showing oneof the brushes secured in position.

A represents a. cylinder or the drum proper, having the spider'arms or spokes B and hub G, for mounting it on its rotating shaft.

D D D represent longitudinal grooves or depressions made in the peripheral face of drum A.

E are bars or strips, usually of wood, fitting in the grooves D.

e are countersunk faces in the bars E.

Frepresents the sand-paper'wound upon the drum A, with an intervening cushion or backing composed" of a layer of rubber, f, and a layer of carpet, f.

G G represent brushes arranged at suitable intervals apart on the peripheral face of the drum, their frames 9 resting in the domes sions formed by pressing or forcing the sandpaper and its cushioned backing into the countersunk faces a of the bars E, to secure them in place on the drum, and having the bristles g projecting slightly beyond the peripheral line of the sandpaper sufficient to come in suitable contact with the object to be polished. Instead of the bristles g of the brushes G, cloth, carpet, chamois, tampico, or other similar polishing material could be used; but

[ they would not be as good for general purposes. The brushes G are secured in place by screws or bolts H, passing through their frames 9 into and through the sand-paper, cushioning rubber and carpet, the backingbars E, and the drum A, thereby securing all the said parts firmly upon the drum.

To provide for the wear of the bristles of the brushes G, bars of greater thickness could be introduced in the depressions D in place of the sand-paper and the polishing-brushes 011 the same drum and operating in unison.

I do not desire to confine myself to the precise construction of the drum and the arrangement of the sand-paper and its adjuncts upon it, as herein shown, as it is obvious various modified changes could be made in these parts without materially afiecting the object of my invention herein described and claimed.

1 claim- 1. Apolishing-drum composed substantially of a cylinder surfaced with sand-paper, and provided with a longitudinal depression containing the frame of a brush which extends bristles of the brush projecting slightly beyond the surface of the sand-paper, substantially as described.

2. Asand-drum fora sandpapering-machine, covered on its peripheral face with sand-paper or other polishing material, and having alterpate series of polishing-brushes and sand-paper, arranged, combined, and adapted to op erate substantially as herein set forth.

3. A sand-drum having its peripheral face covered with sand-paper or other polishing mathis being occasioned by the combination of the bars'E; or additional strips could be in- Y the entire length of the cylinder, with the ICO terial, combined with a series of brushes sel portions of its peripheral face, substantially [O cured to the drum to form a surface of alteras herein set forth. nating brushes and sand-paper, substantially In testimony whereof I have hereunto set as described. my hand in the presence of two subscribing 5 4. A polishing-drum for a sandpaperingwitnesses.

machine, having a portion ofits peripheral face JOHN R. THOMAS.

covered with sand-paper or other similar pol- Witnesses:

ishing material, and alternating with one or THOS. P. EGAN,

more cleaning-brushes, forming a portion or JNO. E. JONES. 

